Classification: ntax_cenozoic -> Mesozoic Survivors -> Chiastozygaceae -> Neocrepidolithus
Sister taxa: Jakubowskia, Neocrepidolithus, Staurolithites, Zeugrhabdotus

Daughter taxa (time control age-window is: 0-800Ma)
Neocrepidolithus cohenii
Unicyclic Neocrepidolithus with closed central area.
Neocrepidolithus cruciatus
Neocrepidolithus with narrow central area filled with an axial cross. Clearly bicyclic in LM.
Neocrepidolithus dirimosus
Bicyclic Neocrepidolithus with closed central area.
Neocrepidolithus fossus
Neocrepidolithus with broad rim and narrow to closed central area. No obvious central structures and unicyclic in LM.
Neocrepidolithus grandiculus
Medium to large Neocrepidolithus with a broad rim, unicyclic in XPL, and a narrow, vacant central area. The central area width is variable, usually around the same width as the rim, but may be narrower or closed.
Neocrepidolithus neocrassus
Neocrepidolithus with bicyclic LM image and narrow to closed central area.
Neocrepidolithus sp.
Specimens which cannot be assigned to any established species


Citation: Neocrepidolithus Romein, 1979
Rank: Genus
Type species: Crepidolithus neocrassus Perch-Nielsen, 1968
Taxonomic discussion: Includes a number of species that are very similar and may represent synonyms (e.g. N. coheni, N. neocrassus and N. fossus).

Distinguishing features: Murolith (loxolith) coccoliths with broad, high rim and narrow or closed central-area, which may be spanned by bars.

Farinacci & Howe catalog pages: Neocrepidolithus *

Size: Most species are 4-7 µm long (ie. medium size) the prime exception is N. grandiculus which is much larger (7-13.5 µm)

Search data:
TagsLITHS: murolith,
MetricsLith size: 4->13.5µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in lower part of Ypresian Stage (28% up, 53.7Ma, in Ypresian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Turonian Stage (0% up, 93.9Ma, in Turonian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs V O

Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 1-231. gs V O


Neocrepidolithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 2-3-2021

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